package ch05_test;
 class A {

     static {

          System.out.print("1");

     }

  

      public A() {

          System.out.print("2");

     }

  }

 

  class B extends A {

     static {

          System.out.print("a");
     }

  

     public B() {

          System.out.print("b");

     }
}

 

  public class Test {

      public static void main(String[] args) {

          A a = new B();

         a = new B();

      }

  }